Chemical structure of glycosphingolipids isolated fromSphingomonas paucimobilis

AbstractTwo novel glycosphingolipids were isolated fromSphingomonas paucimobilis and their structures were completely elucidated. The glycosyl portion of the glycosphingolipid consists of an α-D-Manp-[1→2)-α-D-Galp-(1→6)-α-D-GlcpN-(1→4)-α-D-GlcpA-R tetrasaccharide. The hydrophobic residue R was found to be heterogeneous with respect to the dihydrosphingosine residue.Erythro-1,3-dihydroxy-2-amino-octadecane anderythro-1,3-dihydroxy-2-amino-cis-13,14-methyleneoctadecane were identified in comparable amounts. Both dihydrosphingosine derivatives were quantitatively substituted by an (S)-2-hydroxymyristic acid in amide linkage